Gold futures close with a gain of more than $30 an ounce

WASHINGTON (MarketWatch) -- December gold closed at $757.30 an ounce Tuesday on the Comex division of the New York Mercantile Exchange, up $30.50, or 4.2%. Weakness in the U.S. dollar helped boost investment demand for the precious metal. Other metals followed suit by the close, with December copper up 6.4% and December silver up 3.9%.

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